18257884309 has 16 divisors (see below), whose sum is σ = 21019014016. Its totient is φ = 15535281600.

The previous prime is 18257884303. The next prime is 18257884397. The reversal of 18257884309 is 90348875281.

It is a cyclic number.

It is not a de Polignac number, because 18257884309 - 2⁵ = 18257884277 is a prime.

It is a super-4 number, since 4×18257884309⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18257884309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18257884303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710839 + ... + 736075.

It is an arithmetic number, because the mean of its divisors is an integer number (1313688376).

Almost surely, 2^18257884309 is an apocalyptic number.

It is an amenable number.

18257884309 is a deficient number, since it is larger than the sum of its proper divisors (2761129707).

18257884309 is a wasteful number, since it uses less digits than its factorization.

18257884309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25996.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 18257884309 in words is "eighteen billion, two hundred fifty-seven million, eight hundred eighty-four thousand, three hundred nine".